I buy dog underwear for my dogs when they become in heat. They work wonders, i've tried using little boys tighty whiteys, and they always slide down. So i went and bought some of these for my girls, and boy do they work wonders. They even try to roll around trying to get them off and they wont come off, unless the Velcro hooks on the carpet. ( what they're trying to do in the first place) They sell disposable pads that fit right in the underwear, but i just buy pads and put them in it. My only complaint is that the piece of Velcro isn't big enough to latch to the whole thing, making it easier for them to rip it off. I'm going to try to sew some more Velcro into them and see if it works.